Note 10 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income before income tax expense	$ 44,905	$ 39,340	$ 44,247	$ 42,732	$ 45,339	$ 42,978	$ 42,871	$ 43,870	$ 171,224	$ 175,058	$ 90,390
Federal statutory rate									21.00%	21.00%	21.00%
Computed “expected” Federal income tax expense									$ 35,957	$ 36,762	$ 18,982
State tax, net of federal tax benefit									13,314	9,127	1,913
162M adjustment									777	0	0
Bank owned life insurance									(1,175)	(1,001)	(1,052)
Tax-exempt interest and dividends									(1,969)	(1,405)	(1,491)
Tax benefits from stock-based compensation									(417)	(261)	157
Other, net									(474)	1,483	592
Income tax expense	$ 12,348	$ 10,425	$ 11,889	$ 11,351	$ 12,301	$ 10,881	$ 10,652	$ 10,871	$ 46,013	$ 44,705	$ 19,101